I tried making these on my grill last night, and they turned out OK. I don't think I put enough meat, sauce, cheese in them, and I may have left them on a little too long while I was doing some work outside, but they were still pretty good.
FWI, did you use direct or indirect heat to make these? How long did you keep them in the fridge to set up, and how long did you have them on the fire? Mine didn't look near as nice as yours.